For a Mono US London flowers, earliest pressings are Maroon label (brownish or bright red are slightly later), with Matrix numbers (in the dead wax) ending 1-A.
stone-relics,thanks for info! mine IS original and sounds even better to my ears now(that might be in my head!) I also have an original Aftermath mono that I bought in 66 as a nine year old-it sounds better even w/the scratches than the stereo 70s copy I have. But my favorite is a red label mono "NOW" that I bought at a junk store last year for $1. Also paid 50 cents for Get Off My Cloud and Satisfaction 45s. The 60s(I guess) mono 45 mixes sure sound hot!